unigram and bigram now combine if not enough bigram results
Merge pull request #89 from OwenMcGirr/iss#84

unigram and bigram now combine if not enough bigram results
adapt code for brown corpus
swap out current word prediction database for database with brown corpus
delete test bigram text file from repo
add brown corpus text file to repo
Merge pull request #91 from OwenMcGirr/iss#90

created database using brown corpus